C-C composites are structures in which both matrix and the reinforcement are carbon.

C-C composites have high temperature strength and toughness.

The high cost of C-C composites is a major issue.

All of the above

A only

A, B and C only

A and C only

None of the above

A winter air-conditioning system

A summer air-conditioning system

Filters for removing dust particles

A duct where air is circulated into required space

Insulating with materials whose thickness is below that of critical thickness for insulation.

Providing cooling jackets over the heater pipe surface.

Providing heat exchangers.

Covering heater pipe with another pipe whose thermal conductivity is maller in number and 50 mm thick.

When the hypotenuse of a right-angled triangle is wrapped around the circumference of a cylinder.

When a point moves on the circumference of a cylinder at a ratio of diameter to the pitch of thread.

When a line moves on the circumference of a cylinder with an angle parallel to its axis.

When one of the sides of an equilateral triangle is wrapped around the circumference of a cylinder.